By a News Reporter-Staff News Editor at Science Letter -- New research on Pesticides is the subject of a report. According to news reporting originating in Florianopolis, Brazil, by NewsRx journalists, research stated, "In this study the extraction conditions for the simultaneous extraction of volatile (trihalomethanes - THM) and semi-volatile (organochlorine pesticides) compounds from water samples by direct immersion-headspace-solid phase microextraction (DI-HS-SPME) were optimized and compared. The extraction efficiencies of the proposed DI-HS-SPME and traditional SPME modes were also compared."
The news reporters obtained a quote from the research from Federal University, "The separation and detection were performed by gas chromatography-mass spectrometry in SIM mode (GC-MS-SIM). The variables evaluated were extraction time, extraction temperature and added volume of aqueous NaCl solution at 20% (m/v). Central composite designs were carried out to determine the optimal extraction conditions for each SPME mode. The optimal condition for the DI-HS-SPME mode was 80 min of total extraction time (64 min at 70 degrees C in DI-SPME mode and 16 min at 12 degrees C in HS-SPME mode) with 5 mL of 20% (m/v) NaCl solution. The SPME extraction modes were compared and the DI-HS-SPME produced excellent results for both volatile and semi-volatile compounds. This represents a promising alternative for the analysis of matrices that contain compounds with very different ranges of volatility. The analytical figures of merit were evaluated and good results were obtained using this procedure for both classes of compounds studied."
According to the news reporters, the research concluded: "The limit of quantitation ranged from 0.02 to 2.0 mu g L-1 for organochlorine pesticides and from 0.30 to 0.77 mu g L-1 for THM."
For more information on this research see: Simultaneous determination of trihalomethanes and organochlorine pesticides in water samples by direct immersion-headspace-solid phase microextraction. Journal of Chromatography A, 2013;1321():30-37. Journal of Chromatography A can be contacted at: Elsevier Science Bv, PO Box 211, 1000 Ae Amsterdam, Netherlands. (Elsevier - www.elsevier.com; Journal of Chromatography A - www.elsevier.com/wps/product/cws_home/502688)
Our news correspondents report that additional information may be obtained by contacting J. Merib, Federal University of Santa Catarina, Dept. of Quim, BR-88040900 Florianopolis, SC, Brazil. Additional authors for this research include V. Simao, A.N. Dias and E. Carasek (see also Pesticides).
Keywords for this news article include: Brazil, Pesticides, Florianopolis, South America, Agrochemicals, Trihalomethanes, Halogenated Hydrocarbons
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